A New, Refreshed Engine!

Changes:

New logo!
Game borders!
The engine now has a MM5 theme.
Added a player skin system!
Extendable advanceEntity, bossEntity, weapon, particle, pickupEntity classes!
New save-state system, and changed recs to utilize them.
New game-state system! .tmx files can loaded as a state directly.
New audio manager! Now with proper intro / loop dynamics.
New hotkeys for window scaling, recs, and save-states.
Better and easier weapon management!
Global usage of Tiled template (.tx) files!
Auto-cleaner to set entity classes and megautils callbacks to nil.
Simpler and less error-prone freezing system.
Parallax background entity
Fixed a lot of floating-point precision bugs with collision.
Accurate ice physics
New demo stage.
Many, many bug-fixes.

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